A solid hemisphere has another, smaller solid hemisphere attached to each other at their plane, circular faces, so that the centre C of the circular bases of either coincide. A particle P is then attached to the edge of the plane circular face of the larger hemisphere. The composite object is then rested in equilibrium on a horizontal plane, so that it is in contact with the horizontal plane at the point X on the curved surface of the larger hemisphere. Why is X vertically below C?
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